DE102004024912A1 - Three-phase motor - Google Patents

Abstract

There is provided a three-phase motor having a stator (2) in which the protrusion dimensions of coil end portions (312, 412, 512) in winding coils (3, 4, 5) of the individual phases can be made as equal as possible and the overall protrusion dimension the coil end parts in the winding coils of the three phases can be reduced to an optimum dimension. Single pole coils constituting the winding coils of the three phases each have a pair of coil end portions (312, 412, 512) projecting from end portions in the axial direction of a stator core (21). The winding coils of the three phases have ratios Cv / Cu = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98, where Cu, Cv and Cw average lengths of the coil end portions in the three phases U-phases, Represent V-phase and W-phase forming electrical wires.

Description

The The invention relates to a three-phase motor with a stator, by Inserting winding coils of three phases in on the inner circumferential surface of a Stator core provided grooves is formed.

When one for a stator used in a three-phase motor, a stator is used the successive insertion of winding coils of the U phase, the V phase and the W phase in many at the inner circumferential surface a stator core formed grooves is formed. A stator of the type with distributed winding is known in the multiple Einpolspulen (single-pole coils, coils for one Pole, unipolar coil) by winding electrical wires in several Turns are shaped and over a connecting wire are connected as the winding coil each Phase can be used, and in the Einpolspulen the winding coil each phase are used in a distributed manner in many grooves.

In the stator of the distributed winding type described above is each single pole coil of the V-phase winding coil with respect to each Einpolspule the U-phase winding coil and is each unipolar coil of the W-phase winding coil with respect to each unipolar coil of the V-phase winding coil in circumferential Direction offset by a predetermined number of grooves, and each this coil is in this way in each groove on the stator core used. The remaining part of each unipolar coil of the winding coil every phase that is not used in every slot jumps off an end portion in the axial direction of the stator core and forms a coil end portion of each phase.

As it is in 12 is shown have Einpolspulen 931 . 941 and 951 the U-phase, V-phase and W-phase winding coils 93 . 94 and 95 essentially the same circumferential length.

It is at coil end parts 932 . 942 and 952 Of the phases described above, the coil end part 942 the V-phase on the inner circumferential side of the coil end part 932 superimposed on the U phase, and is the coil end part 952 the W-phase on the inner circumferential side of the coil end portion 942 superimposed on the V phase as it is in 13 is shown. Therefore, to insert the V-phase winding coil 94 in a stator core 921 the coil end part 932 the U-phase are deformed and to the outer circumferential side of the stator core 921 be moved. Furthermore, to insert the W-phase winding coil 95 in the stator core 921 the coil end part 942 be deformed to the V-phase and to the outer circumferential side of the stator core 921 be moved.

Therefore, the coil end parts 932 . 942 and 952 of the phases described above have the following forms. That is, the coil end part 942 the V phase of an end part 922 in the axial direction of the stator core 921 further than the coil end part 932 the U-phase, and the coil end part 952 the W phase jumps from the end part 922 in the axial direction of the stator core 921 further than the coil end part 942 the V phase ago. This makes it difficult to calculate the overall dimensions of the coil end parts 932 . 942 and 952 to reduce the three phases.

In one for A stator used in a single-phase motor is the circumferential length of one arranged on the inner circumferential side of a stator core Winding shorter as the orbiting length of a on the outer circumferential side arranged winding, which is why a deflection at a coil end part thus reduced to the size of this Reduce coil end portion (Patent Reference 1).

However, in the three-phase motor, it is important to have the coil end parts 932 and 942 of the U-phase and V-phase to the outer circumferential side of the stator core 921 to be deformed and displaced to an optimum size. It is necessary, the ratio of the lengths of the coil end parts 932 . 942 and 952 to optimize the U phase, the V phase and the W phase forming electric wires. Therefore, the technique of Patent Reference 1 can not be directly applied to the three-phase motor.

Patent reference 1: JP-UM-A-5-78177

In With regard to the above-described problem in the prior art The present invention is based on the object, a three-phase motor to provide with a stator in which the projection dimensions of coil end parts of winding coils of three phases so the same as possible can be made and wherein the overall projection dimensions of the coil end portions of the Winding coils of the three phases reduced to an optimal dimension can be. Preferably, the overall dimensions of the coil end parts of the Winding coils of the three phases without generation of a difference be reduced in the conductor resistance value of the winding coils of the three phases, if possible.

According to a first embodiment of the invention, in a three-phase motor having a stator, by successive insertion of winding coils of the three phases U-phase, V-phase and W-phase is formed in grooves provided on an inner circumferential surface of a stator core, the winding coils of each phase are formed by connecting a plurality of unipolar coils formed by winding electric wires and a plurality of turns, and each of the unipolar coils has a pair Inserting parts to be inserted in the grooves, and a pair of coil end parts connecting the pair of insertion parts.

The Winding coils of the three phases have the ratios Cv / Cv = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98, where Cu is an average length of electrical wires which illustrates the coil end portions of each of the single pole coils in the U-phase winding coil form, Cv an average length the wires illustrating the coil end portions of each of the Einpolspulen in the V-phase winding coil and Cw represents an average length of the electrical wires, the coil end portions of each of the Einpolspulen in the W-phase winding coil form.

In the three-phase motor according to this Embodiment of the invention, the stator is designed such that The relationship the average lengths the coil end portions of each of the Einpolspulen in the winding coils of the three phases forming electric wires between the U-phase, the V-phase and the W phase are optimized.

The is called, that according to this Embodiment of the invention, the average lengths CU, CV and CW of the Coil end parts of the winding coils of the three phases forming electrical wires in the relationship Cu> Cv> Cw are located.

Of the Stator is shaped by first the winding coil of the U phase is inserted into the stator core, then the winding coil of the V-phase inserted into the stator core and then the winding coil of the W phase in the stator core is used. In the stator, the pair of insertion parts of the winding coil each phase inserted into the grooves, and the pair of coil end parts the winding coil of each phase jumps from the end parts in the axial Direction of the stator core.

there After the pair of insertion parts of the U-phase winding coil into the slots of the stator core has been used, the pair of coil end portions of the U-phase winding coils deformed and become an outer circumferential Side of the stator core, so that the V-phase and W-phase winding coils be used in the stator core. In this case, the average length Cu is the the coil end parts of the U-phase winding coil forming electrical wires the longest all average lengths the electric wires the winding coils of the three phases, as described above has been. Therefore, you can the coil end parts of the U-phase winding coil are light and strong deformed and to the outer circumferential Side of the stator core.

If the pair of insertion parts of the V-phase winding coil are inserted into the slots of the stator core becomes, the pair of coil end portions of the V-phase winding coil partially superimposed on an inner circumferential side of the pair of coil end parts of the U-phase winding coil.

After this the pair of insertion parts of the V-phase winding coil in the slots of the stator core has been used, the pair of coil end parts of the V-phase winding coil deformed and to the outer circumferential Side of the stator core, so that the W-phase winding coil is used in the stator core.

In In this case, the average length Cv of the electric wires is the coil end parts of the V-phase winding coil make longer as the average length Cw forming the coil end portions of the W-phase winding coil wires as described above. Therefore, the Coil end parts of the V-phase winding coil easily deformed and to the outer circumferential Side of the stator core.

If the pair of insertion parts of the W-phase winding coils are inserted into the slots of the stator core is, the pair of coil portions of the W-phase winding coil becomes partial superposed on an inner tapered side of the pair of coil end parts of the V-phase winding coil. The pair of coil end parts of the W-phase winding coil becomes in the stator core provided without being severely deformed or displaced.

On in this way, the coil end parts of the U-phase winding coil, the electric wires with the longest Average length Cu of all average lengths the winding coils of the three phases, the most deformed and moved. The coil end parts of the V-phase winding coil, the electrical wires with an average length Cv that lasts longer than the average length of electrical wires the W-phase winding coil is, deformed and moved. The coil end parts of the W-phase winding coil, the the electric wires the shortest Average length Cw of all average lengths the winding coils of the three phases is not greatly deformed and moved. Thus, you can the protrusion dimensions, that is, the lengths of the protrusions of the coil end parts in the winding coils of the three phases of the end portion in axial Direction of the stator core made as short and equal as possible become.

Farther are in accordance with the invention the ratios the average lengths forming the coil end portions of the winding coils of the three phases electrical wires in the relationships of Cv / Cu = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98. Therefore, you can the coil end parts of the winding coil of each phase to an optimum Size deformed and be moved.

Therefore can in the three-phase motor with the stator described above Protrusion dimensions of the coil end portions of the winding coils of three phases as equal as possible be made and could the overall dimensions of the projection of the coil end portions of the winding coils of three phases are reduced to an optimal dimension.

The A pair of the coil end portions of the U-phase winding coil may be deformed and be moved while the V-phase winding coil is used in the stator core. If possible, the pair of coil end parts the U-phase winding coil deformed and shifted before the U-phase winding coil is used in the stator core. The coil end parts of the V-phase and the W-phase winding coil can be similarly deformed and be moved.

The Average lengths Cu, Cv and Cw of the coil end parts are the average lengths Cu, Cv and Cw of the coil end parts on one side of each pair of the coil end parts.

The the coil end parts forming electrical wires on one side of each pair the coil end parts, or the individual electrical appliances that forming the pair of coil end parts may be those described above conditions of Cv / Cu = 0.88-0.98 and Cw / Cv = 0.88 to 0.98.

According to one Second embodiment of the invention comprises in a three-phase motor with a stator by inserting winding coils of the three Phases U-phase, V-phase and W phase in on an inner circumferential surface of a Stator core provided grooves is formed, the winding coil each phase a variety of unipolar coils, by winding electrical wires be formed in a variety of turns, a connecting wire for connecting the Einpolspulen and a pair of pipe parts, by removing the electrical wires from the arranged at both ends of the plurality of Einpolspulen Einpolspulen be formed, and includes each of Einpolspulen Pair of inserts to be inserted in the grooves and a pair Has coil end parts that connects the pair of insertion parts.

In Terms of average circumference lengths of Single pole coils in the winding coils of the three phases is the average circumferential length in the V-phase winding coil shorter as the average perimeter length in the U-phase winding coil, and is the average circumferential length in the W-phase winding coil shorter as the average perimeter length in the V-phase winding coil.

The A pair of insert parts of the U-phase winding coil is inserted in the grooves and the pair of coil end portions of the U-phase winding coil jumps from the end parts in the axial direction of the stator core.

The Pair of insert parts of the V-phase winding coil is inserted into the slots of the U-phase winding coil offset by a predetermined number of grooves in a first direction, which is one circumferential direction of the stator core, and the pair of coil end parts the V-phase winding coil partially on an inner circumferential Side of the pair of coil end parts of the U-phase winding coil overlaid becomes.

The A pair of the insertion parts of the W-phase winding coil is inserted in the grooves by a predetermined number of grooves in the first Direction of the stator core offset, and the pair of coil end parts the W-phase winding coil becomes partially on an inner circumferential side of the pair of coil end parts superimposed on the V-phase winding coil.

From the pair of line parts of the winding coil of each phase is the Conduction part, which at one end part in a second direction, the opposite to the first direction of the stator core is arranged is, as neutral point line part (line part on the neutral point side) used. The neutral point line parts of the winding coils of three phases become the formation of a neutral point at a position bundled, at which an offset from the U-phase winding coil by a predetermined Angle is made in the second direction, so that the neutral point line part the V-phase winding coil longer is the neutral point line part of the U-phase winding coil, and the neutral point line part of the W-phase winding coil is longer than the neutral point line part of the V-phase winding coil.

In the three-phase motor according to this aspect of the present invention, the stator is designed so that the circumferential average length of the unipolar coils in the winding coils of each phase is varied per phase, thereby reducing the overall dimensions of the coil end portions of the winding coils of the three phases. Furthermore, the length of the neutral point line part becomes the winding coil of each phase per phase varies inversely with the circumferential average length per phase, thereby reducing the problem due to the variance of the circumferential average length.

The is called, that according to this Embodiment of the present invention with respect to the average cycle length of Single pole winding of the winding coils of the three phases, the average cycle length of V-phase winding coil shorter as the average revolution length the U-phase winding coil and the average revolution length of the W-phase winding coil shorter as the average revolution length the V-phase winding coil.

Of the Stator is formed by first the U-phase winding coil is inserted into the stator core, then the V-phase winding coil is used in the stator core and can the W-phase winding coil is used in the stator core. In the stator, the pair of the Insertion parts of the winding coil of each phase by a predetermined number offset from grooves each when inserted into the grooves, and the pair of coil end portions of the winding coil of each phase jumps from End portions in the axial direction of the stator core before.

there After the pair of insertion parts of the U-phase winding coil into the slots of the stator core is inserted, the pair of coil end portions of the U-phase winding coil deformed and to an outer circumferential one Side of the stator core, so that the V-phase and W-phase winding coils be used in the stator core. In this case, the average round trip length is the Einpolspulen the U-phase winding coil long since all average cycle lengths in the winding coils of the three phases, as described above has been. Therefore, the pair of coil end parts of the U-phase winding coil can easily and strongly deformed and to the outer circumferential side of the Stator cores are moved.

If the pair of insertion parts of the V-phase winding coil are inserted into the slots of the stator core becomes, the pair of coil end portions of the V-phase winding coil partially superposed on the inner circumferential side of the pair of coil end parts of the U-phase winding coil.

After this the pair of insertion parts of the V-phase winding coil in the slots of the stator core is inserted, the pair of coil end portions of the V-phase winding coil is deformed and to the outer circumferential Side of the stator core shifted so that the W-phase winding coil in the stator core is used. In this case, the average round trip length is the Einpolspulen the V-phase winding coil longer than the average cycle length of Single-pole coils in the W-phase winding coil, as described above. Therefore, the pair of the Coil end parts of the V-phase winding coil slightly deformed and to the outer circumferential Side of the stator core.

If the pair of insertion parts of the W-phase winding coil are inserted into the slots of the stator core becomes, the pair of coil end portions of the W-phase winding coil partially superposed on the inner circumferential side of the pair of coil end parts of the V-phase winding coil. The pair of coil end parts of the W-phase winding coil is provided without being heavily deformed or displaced.

The A pair of coil end portions of the U-phase winding coil may be inserted deformed and shifted in the stator core of the V-phase winding coil become. If possible, For example, the pair of coil end portions of the U-phase winding coil may be prior to insertion of the U-phase winding coil deformed and moved in the stator core. The coil end parts The V-phase and W-phase winding coils can be similarly deformed and shifted become.

On This way, the Einpolspulen in the U-phase winding coil with the longest average round of all Average circulation lengths in the winding coils of the three phases most deformed and shifted. The coil end portions of the U-phase winding coil having the longer average revolution length than the average rotation length the W-phase winding coil are deformed and shifted. The Coil end parts of the W-phase winding coil with the shortest average round of all Average circulation lengths in the winding coils of the three phases are not greatly deformed and moved. In this way, the projection lengths of the coil end parts in the winding coils of the three phases of the end parts in axial Direction of the stator core made as short and equal as possible become. this makes possible a reduction in the overall dimensions of the coil end portions of the winding coils the three phases.

According to this Embodiment of the invention is the state of the generation of the neutral point accurately designed so that the difference in the average orbital length of the Poling is compensated between the winding coils of the three phases.

That is, the neutral point is obtained by bundling the neutral point line parts (line parts on the neutral point side) at the end in the second direction are arranged, the individual pairs of the lead wires of the winding coils of the three phases is formed at a position at which an offset from the U-phase winding coil is made by a predetermined angle in the second direction.

Therefore become the lengths the neutral point line parts of the winding coils of the three phases in different ways the average circulation lengths the Einpolspulen in the winding coils of the three phases varies. The neutral point line part of the V-phase winding coil is longer than the neutral point line part the U-phase winding coil, and the neutral point line part of W-phase winding coil is longer as the neutral point line part of the V-phase winding coil.

Therefore can the difference in the average round trip length of Einpolspulen between the winding coils of the three phases by the lengths of the neutral point line parts the winding coils of the three phases are compensated. This can the difference in the total length minimize the electrical wires, which form the winding coils of the three phases.

at the three-phase motor with the stator described above can the difference in the conductor resistance in the winding coils of three phases can be minimized, and the overall extent of the Coil end portions of the winding coils of the three phases can be reduced.

below the drawing is briefly described. Show it:

1 an explanatory view of the state of a stator core, in which neutral point is formed in Example 1, seen from an end portion in the axial direction,

2 12 is an explanatory diagram schematically showing the difference in the average round-trip length of single-pole coils between U-phase, V-phase and W-phase coil coils and the difference in the length of a neutral point line part between the U-phase, V-phase and W Phase winding coils in Example 1 illustrates

3 an explanatory view of a state in which the U-phase, V-phase and W-phase winding coils are inserted into the stator core according to Example 1, viewed from the end portion in the axial direction of the stator core,

4 an explanatory view of a state in which project coil end portions of the U-phase, V-phase and W-phase winding coils of the end portion in the axial direction of the stator core,

4 an explanatory view of a state in which the neutral point line parts of the U-phase, V-phase and W-phase winding coils are bundled to form a neutral point according to Example 1, seen from the end portion in the axial direction of the stator core,

6 FIG. 4 is an explanatory diagram schematically illustrating an electric circuit in which a star connection of the U-phase, V-phase, and W-phase winding coils is performed to form a neutral point in Example 1; FIG.

7 an explanatory view showing a state when inserting the U-phase, V-phase and W-phase winding coils in the stator core according to Example 1 seen from the end portion in the axial direction of the stator core,

8th an explanatory view of a state in which the U-phase winding coils is inserted into the stator core in Example 1, seen from the end portion in the axial direction of the stator core,

9 an explanatory view of a state when inserting the V-phase winding coil in the stator core according to Example 1 seen from the end portion in the axial direction of the stator core,

10 12 is an explanatory diagram schematically illustrating a state in which the coil end parts of the U-phase, V-phase and W-phase winding coils project from the end parts in the axial direction of the stator core according to Example 1;

11 an explanatory view of a state when inserting the U-phase, V-phase and W-phase winding coils in a stator core according to Example 3 seen from an end portion in the axial direction of the stator core,

12 FIG. 4 is an explanatory diagram schematically illustrating average circulation lengths of unipolar coils in the U-phase, V-phase, and W-phase winding coils in a conventional example; and FIG

13 12 is an explanatory view showing a state in which coil end parts of the U-phase, V-phase, and W-phase winding coils project from an axial direction end part of a stator core in a conventional example.

preferred embodiments the above-described three-phase motor according to the invention are described below.

According to this Invention is, if the ratio Cv / Cu is less than 0.88, the average length Cv of the coil end parts shorter than the V-phase winding coil forming electric wires Average length Cu forming the coil end portions of the U-phase winding coil electrical wires, and the protrusion dimension of the coil end portions of the U-phase winding coil becomes greater than the protrusion dimension of the coil end portions of the V-phase winding coil. Therefore, you can the protrusion dimensions of the coil end portions of the winding coils the three phases are not made as far as possible the same.

If In contrast, The relationship Cv / Cu greater than 0.98 is the average length Cv forming the coil end portions of the V-phase winding coil electrical wires close to the average length CU forming the coil end portions of the U-phase winding coil electrical wires. If the coil end parts of the U-phase winding coil optimally deformed and shifted, the protrusion dimension becomes the coil end portions of the U-phase winding coil smaller than the protrusion dimension of the coil end portions of the V-phase winding coil. Therefore, you can the protrusion dimensions of the coil end portions of the winding coils the three phases are not made as far as possible the same.

If The relationship Cw / Cv is less than 0.88, the average length Cw is the the coil end parts of the W-phase winding coils forming electrical wires shorter as the average length Cv forming the coil end portions of the V-phase winding coil electrical wires. Even if the coil end parts of the V-phase winding coil optimally deformed and shifted, the projection dimension of the Coil end portions of the V-phase winding coil larger than the protrusion dimension the coil end portions of the W-phase winding coil. Therefore, you can the protrusion dimensions of the coil end portions of the winding coils the three phases are not made as far as possible the same.

If In contrast, The relationship Cw / Cv greater than 0.98 is the average length Cw forming the coil end portions of the W-phase winding coil electrical wires close to the average length Cv forming the coil end portions of the V-phase winding coil electrical wires. If the coil end parts of the V-phase winding coil optimally deformed and shifted, the protrusion dimension becomes the coil end portions of the V-phase winding coil smaller than the protrusion dimension of the coil end portions of the W-phase winding coil. Therefore, you can the protrusion dimensions of the coil end portions of the winding coils the three phases are not made as far as possible the same.

It It is further preferable that the ratios described above Cv / Cu and Cw / Cv are as follows: CV / Cu = 0.90 to 0.95 and Cw / Cv = 0.90 to 0.95.

In In this case, the circumstances Cv / Cu and Cw / Cv are better optimized and can control the protrusion dimensions the coil end portions of the winding coils of the three phases easier be made equal.

The Overall projection dimension of the coil end portions of the winding coils The three phases can be reduced to a more optimal dimension.

It It is preferable that the pair of insertion parts of the U-phase winding coil is inserted into the grooves, and that the pair of coil end parts the U-phase winding coil protrudes from the end portions in the axial direction of the stator core. It is preferable that the pair of insertion parts of the V-phase winding coil when inserted into the slots of the U-phase winding coil by one predetermined number of slots in a circumferential direction of the stator core is offset, and that the pair of coil end portions of the V-phase winding coil partly on the inner circumferential side of the pair of coil end parts the U-phase winding coil is superimposed. It is preferable that the pair of insertion parts of the W-phase winding coil at Insertion in the grooves of the V-phase winding coil by a predetermined Number of grooves is offset in a circumferential direction of the stator core, and partially on the pair of coil end parts of the W-phase winding coil superimposed on the inner circumferential side of the pair of coil end parts of the V-phase winding coil is (claim 2).

In this case can the individual pairs of the insertion parts of the U-phase, V-phase and W-phase winding coils a predetermined number of grooves each when inserted into the Grooves are offset. The overall projection dimension of the coil end parts The winding coils of the three phases can be more easily optimized Dimension can be reduced.

It It is also preferable that the ratio Cv / Cu and the ratio Cw / Cv are substantially equal (claim 3).

In this case, the ratio of Cv / Cu and Cw / Cv are optimized, and the protrusion dimensions of the coil end portions of the winding coils of the three phases can be made easier to be equalized. The overall protrusion dimensions of the coil end portions of the winding coils of the three phases can be reduced to a more optimal dimension.

It is also preferable that the orbital length of the electric wires, the the Einpolspulen (unipolar coils) forming electrical wires of form at least one of the winding coils of the three phases, to the outer circumferential side shorter than the stator core is (claim 4).

In In this case, in at least one of the winding coils of the three Phases used in the stator core, the side at which the electrical wires the Einpolspulen a shorter circumferential length facing the grooves of the stator core and is inserted therein. Therefore, you can in the coil end parts of each of the unipolar coils of the electric wire part, the one opposite to the side too the side is arranged, which faces the grooves, stronger the outer circumferential Side of the stator core are deformed and moved. Accordingly can the coil end parts are more easily deformed and shifted, and can the protrusion dimensions of the coil end portions of the winding coils the three phases of the end portions in the axial direction of the stator core easier to be made equal.

The Einpolspulen in which the circumferential length of the Einpolspulen forming electrical wires too the outer circulation side shorter than the stator core will, can only for the U-phase and V-phase winding coils are used. Both Single pole coils of the W-phase winding coils can Einpolspulen be used in which the circumferential length of the electrical wires themselves hardly changes.

It is also preferable to that in terms of rate of change the orbital length the electric wires the rate of change the U-phase winding coil higher as the rate of change is the V-phase winding coil, and that the rate of change of the V-phase winding coil higher than the rate of change the W-phase winding coil is (claim 5).

In In this case, the rates of change of circumferential length the electric wires the coil end portions of the winding coils of each phase under consideration set that the coil end portions of the U-phase winding coil stronger than the Coil end parts of the V-phase winding coils deformed and are shifted, and that the coil end portions of the V-phase winding coil stronger deformed and shifted as the coil end portions of the W-phase winding coil become.

The is called, that if the rate of change the orbital length the electric wires for the Coil end parts of the winding coils is made higher, the stronger deform and move, the overall projection dimensions the coil end parts of the winding coils of the three phases forming electrical wires as far as possible can be made equal after the coil end parts are deformed and shifted.

For the Einpolspulen in the W-phase winding coil Einpolspulen be used, in which the orbital length of the electrical wires themselves hardly changes. The rate of change in the W-phase winding coil may be substantially zero.

According to the present invention, it is preferable that the average revolution length Lv of the one-pole coils in the V-phase winding coil and the average revolution length Lw of the one-pole coils in the W-phase winding coil satisfy the following relationships: Lv = (S · Lu · n · m - 2 · π · R · Sv) / (S · n · M) and Lw = (S · Lu · n · m - 2 · π · R · Sw) / (S · n · M)

there Lu represents the average revolution length of the single pole coils in the U-phase winding coil, n represents the number of turns of each One-pole coil in the winding coil of each phase represents m the Number of poles of the unipolar coils in the winding coil of each phase represents π (pi) The relationship of the orbit of a circle to its diameter, R represents the Radius from the center of the stator core to the center in the radial direction of the groove (hereinafter referred to as the average radius of the stator core S) represents the total number of slots in the stator core , Sv represents the number of slots around which the V-phase winding coil of FIG U-phase winding coil offset in the first direction of the stator core and Sw represents the number of slots around which the W-phase winding coil of the U-phase winding coil in the first direction of the stator core is offset (claim 13).

In this case, the average round trip lengths of the unipolar coils in the three-phase winding coils are varied by the difference amount in the length of neutral point line parts (neutral-point-side line parts) between the three-phase winding coils. In this case, since the total lengths of the electric wires constituting the winding coils of the three phases are made substantially equal, the wiring resistance value in the winding coils of the three phases can be made substantially equal the.

The The values calculated from the equation equations Lv and Lw are theoretical formed values. In the case of actually producing the winding coils of the three phases, the neutral point and the like may be some Errors occur.

The Relational equations Lv and Lw described above are modifications of relationship equations 2 · π · R · Sv / S = (Lu - Lv) · n · m and 2 · π · R · Sw / S = (Lu - Lw) · n · m.

The is called, in the relationship equation of Lv, the magnitude (the extent) is around the the length of the neutral point line part of the V-phase winding coil is longer than the length of the neutral point line part of the U-phase winding coil is 2 · π · R · Sv / S. In the relationship equation of Lv, the size is the average round trip length of the unipolar coils in the U-phase winding coil longer as the average rotation length the Einpolspulen in the V-phase winding coil is, Lu - Lv. The Relationship equation of Lv is taking into account the number of Windings of each Einpolspulen in the winding coil of each phase and the number of poles m of Einpolspulen in the winding coil each Derived phase.

In The relationship equation of Lw is the size by which the length of the Neutral point line part of the W-phase winding coil longer than the length of the Neutral point line part of the U-phase winding coil is 2 · π · R · Sw / s. In the relationship equation of Lw is the size by which the average rotation length of the Einpolspulen in the U-phase winding coil longer than the average revolution of the Einpolspulen in the W-phase winding coil is, Lu - Lw. The relationship equation LW is also under consideration the number of turns of each unipolar coil in the winding coil each phase and the number of poles m of Einpolspulen in the winding coil derived from each phase.

It is also preferable that the orbital length of the Einpolspulen in the U-phase and V-phase winding coils forming electrical wires to the outer circulation side shorter than the stator core becomes (claim 14).

In In this case, the U-phase used in the stator core and V-phase winding coils the side at which the electrical Wire each Einpolspule a shorter one circumferential length facing the grooves of the stator core and is inserted therein. Therefore, in the coil end parts of each Einpolspule the electric Wire part, which is arranged on the side, which are opposite to the groove side facing, stronger to the outer circumferential side deformed and moved from the stator core. Accordingly can the coil end parts are more easily deformed and shifted, and may be the overall dimension of the coil end portions of the winding coils the three phases are further reduced.

It It is also preferable that in terms of rates of change the circulation lengths the electric wires the rate of change higher in the U-phase winding coil as the rate of change in the V-phase winding coil is (claim 15).

In In this case, the pair of coil end parts of each unipolar coil in the U-phase winding coil lighter than the pair of coil end parts each unipolar coil in the V-phase winding coil deformed and moved. Therefore, the overall size of the Further reduces coil end portions of the winding coils of the three phases become.

Examples for the Three-phase motor according to the present Invention are described below with reference to the drawings described.

example 1

As it is in 1 is shown is a three-phase motor 1 according to this example in three-phase AC motor and has a stator of the distributed winding type 2 on, in the winding coils 3 . 4 and 5 the three-phase U-phase, V-phase and W-phase successively distributed in many grooves 211 are used, which on the inner circumferential side of an annular stator core 21 are provided.

As it is in 2 shows, each of the winding coils 3 . 4 and 5 the three-phase multiple Einpolspulen 31 . 41 or 51 caused by multiple winding electrical wires 100 are shaped, connecting wires 34 . 44 or 54 for connecting the Einpolspulen 31 . 41 or 51 and a pair of pipe parts 32 and 33 . 42 and 43 or 52 and 53 on, by removing the electrical wires 100 from the Einpolspulen 31 . 41 or 51 at both ends of the plurality of Einpolspulen 31 . 41 or 51 are arranged.

As it is in 2 shows, each of the Einpolspulen 31 . 41 and 51 a pair of inserts 311 . 411 or 511 in the grooves 211 are to be inserted, and a pair of coil end parts 312 . 412 or 512 for connecting the pair of inserts 311 . 411 or 511 on.

In terms of average circulation conditions (average winding diameter) of the Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 Of the three phases, the average revolution length in the V-phase winding coil is shorter than the average revolution length in the U-phase winding coil, and the average revolution length in the W-phase winding coil is shorter than the average revolution length in the V-phase winding coil.

As it is in 3 to 5 shown is the pair of insert parts 311 the U-phase winding coil 3 into the grooves 211 used, and jumps the pair of coil end parts 312 the U-phase winding coil 3 of end parts 212 in the axial direction of the stator core 21 in front.

The pair of insert parts 411 the V-phase winding coil 4 when inserting into the grooves 211 opposite to the U-phase winding coil 3 offset by a predetermined number of grooves in a first direction C1, the one circumferential direction of the stator core 21 is. The pair of coil end parts 412 the V-phase winding coil 4 becomes partially on the inner circumferential side of the pair of coil end parts 312 superimposed on the U-phase winding coil.

The pair of insert parts 511 the W-phase winding coil 5 is opposite to the V-phase winding coil 4 when inserting into the grooves 211 by a predetermined number of slots in the first direction C1 of the stator core 21 added. The pair of coil end parts 512 the W-phase winding coil 5 becomes partially on the inner circumferential side of the pair of coil end parts 412 superimposed on the V-phase winding coil.

The winding coils 3 . 4 and 5 of the three phases have the relationships Cv / Cu =, 88 to 0.98 and Cw / Cv = 0.88 to 0.98, where Cu is the average length of the coil end parts 312 each of the Einpolspulen 31 in the U-phase winding coil 3 forming electrical wires 100 Cv represents the average length of the coil end parts 412 each of the Einpolspulen 41 in the V-phase winding coil 4 forming electrical wires 100 and Cw is the average length of the coil end parts 512 each of the Einpolspulen 51 in the W-phase winding coil 5 forming electrical wires 100 represents (compare 10 ).

As it is in 1 . 2 and 5 is shown in the stator 2 the lead part, which is at the Enteil in one to the first direction C1 of the stator core 21 opposite second direction C2 is arranged, the pair of line parts 32 and 33 . 42 and 43 or 52 and 53 the winding coil 3 . 4 or 5 each phase as neutral point line part (line part on the neutral point side) 32 . 42 or 52 used. In the stator 2 are the neutral point line parts 32 . 42 and 52 to form a neutral point 6 bundled at a position at which an offset relative to the U-phase winding coil 3 is performed in the second direction C2 by a predetermined angle.

When the neutral point 6 is formed, the neutral point line part 42 the V-phase winding coil 4 longer than the neutral point line part 32 the U-phase winding coil 3 , Furthermore, the neutral point line part 52 the W-phase winding coil 5 longer than the neutral point line part 42 the V-phase winding coil 4 ,

Of the Construction will be described in more detail below.

As it is in 2 and 6 is shown in the three-phase motor 1 according to this example, the stator 2 such that the ratios of the average lengths Cu, Cv and Cw of the coil end portions 312 . 412 and 512 the Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 of the three phases forming electrical wires 100 are set to be optimal between the U-phase, the V-phase and the W-phase.

The electric wire 100 According to this example, it is formed by bundling a plurality of electric wires. In this example are 10 Wires for forming the electric wire 100 bundled.

In the three-phase engine 1 According to this example, the average circumferential length of Einpolspulen 31 . 41 or 51 in the winding coil 3 . 4 or 5 each phase for each phase varies, thereby increasing the overall projection dimension L1 of the coil end portions 312 . 412 and 512 the winding coils of the three phases reduced (see 4 and 10 ). Furthermore, the length of the neutral point line part becomes 32 . 42 or 52 the winding coil 3 . 4 or 5 Each phase varies inversely with the average cycle length, reducing the problem due to the variance of the average cycle length.

The average length Cu, Cv or Cw is the average of the lengths of the plurality of electric wires 100 that the coil end parts 312 . 412 or 512 the winding coil 3 . 4 or 5 form each phase. The average revolution length is the average of the circumferential lengths of the plurality of electric wires 100 that the unipolar coils 31 . 41 or 51 in the winding coil 3 . 4 or 5 form each phase.

2 and 6 show explanatory diagrams that schematically show the difference in through cutting perimeter length between the Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 of the three phases, and the difference in length between the neutral point parts 32 . 42 and 52 the winding coils 3 . 4 and 5 the three phases illustrated. 6 also shows an explanatory illustration of an electric circuit passing through the winding coils 3 . 4 and 5 the three phases is formed. In the stator 2 according to this example is a star connection of the winding coils 3 . 4 and 5 of the three phases to form the neutral point 6 executed.

As it is in 2 is shown, the winding coils 3 . 4 and 5 of the three phases according to this example three-phase (tripolar) winding coils, each three Einpolspulen 31 . 41 or 51 exhibit.

10 shows an explanatory diagram in which a state is shown schematically, in which the coil end parts 312 . 412 and 512 the winding coils 3 . 4 and 5 the three phases of the end parts 212 in the axial direction of the stator core 21 protrude. According to 10 the coil end parts jump 312 . 412 and 512 of the three phases in a C-shape from the end parts 212 in the axial direction of the stator core 21 in front. The length Cx of the insert parts 311 . 411 and 511 the three phases is substantially equal to the length in the axial direction of the stator core 21 , The protrusion dimension L1, which is the protrusion length of the coil end parts 312 . 412 and 512 the three phases of the end parts 21 in the axial direction of the stator core 21 is, runs from the end part 212 in the axial direction of the stator core 21 to distal (distant from the stator core) end parts 313 . 413 and 513 in the axial direction of the coil end parts 312 . 412 and 512 of the three phases (cf. 4 ).

As it is in 1 is shown, the three-phase motor 1 a rotor 10 on the inner circumferential side of the stator 2 turns.

As it is in 1 . 2 and 6 is shown in the stator 2 the lead part disposed at an end part in the first direction C1 of the pair of lead parts 32 and 33 . 42 and 43 or 52 and 53 the winding coil 3 . 4 and 5 every phase as a power line unit 33 . 43 or 53 used that with a power supply to power each winding coil 3 . 4 or 5 connected is.

As it is in 3 is shown are the Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 of the three phases according to this example with predetermined distances in the grooves 211 used.

Therefore, as it says in 2 and 4 shown is the pair of inserts 311 . 411 or 511 each of the Einpolspulen 31 . 41 or 51 in the winding coil 3 . 4 or 5 each phase substantially the same length, the difference in the average circumferential lengths between the winding coils 3 . 4 and 5 The three phases are actually the difference in the length of the electrical wires 100 that is the pair of coil end parts 312 . 412 and 512 form.

As it is in 2 is the average circumferential length of the single pole coils 31 in the U-phase winding coil 3 Run the longest so that the pair of coil end parts 312 the U-phase winding coil 3 first in the stator core 21 is used, the strongest among the three phases to the outer circumferential side of the stator core 21 deformed and shifted. The average envelope length of the single-pole coils 51 in the W-phase winding coil 5 is the shortest listed because the pair of coil end parts 512 the W-phase winding coil 5 last in the stator core 21 is used, does not have to be heavily deformed and moved. The average perimeter length of the unipolar coils 41 in the V-phase winding coil 4 is shorter than the average circumferential length in the U-phase winding coil 3 and longer than the average circumferential length in the W-phase winding coil 5 ,

As it is in 4 is shown, the average lengths Cu, Cv and Cw of the coil end parts 312 . 412 and 512 the winding coils 3 . 4 and 5 of the three phases forming electrical wires 100 the following relationship: Cu>Cv> Cw. The protrusion dimensions, that is, the protrusion lengths of the pair of coil end parts 312 . 412 or 512 from the end parts 212 in the axial direction of the stator core 21 are essentially the same. The relationships of Cv / Cu = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98 apply to both coil end portions of each pair of the coil end portions 312 . 412 or 512 ,

The average lengths Cu, Vc and Cw of the coil end parts 312 . 412 and 512 are average lengths Cu, Vc and Cw of the coil end parts 312 . 412 and 512 on one side of the pairs of coil end parts 312 . 412 and 512 ,

As it is in 7 is shown are the Einpolspulen 31 . 41 in the U-phase and V-phase winding coils 3 and 4 bevelled (tapered) Einpolspulen 31 and 41 , in which the circulation length (winding diameter) of the electric wire 100 to one end in the direction of a coil axis 101 gets longer, which is the central axis of the winding of the electric wire 100 is. In the U-phase and V-phase winding coils 3 and 4 will cause the side at which the orbital length of the unipolar coils 31 and 41 forming electrical wires 100 shorter, each groove 211 of the stator core 21 is facing and thus in the stator core 21 used becomes.

In each of the Einpolspulen 31 and 41 in the U-phase and V-phase winding coils 3 and 4 will if the pair of insert parts 311 or 411 into the grooves 211 of the stator core 21 is used, the part where the circumferential length of the electric wire 100 longer, the pair of coil end parts 312 or 412 stronger to the outer circumferential side of the stator core 21 deformed and moved.

As it is in 7 is shown with respect to the U-phase and V-phase winding coils used in the stator core 3 and 4 the rate of change of the circumferential length of the electric wire in the U-phase winding coil 3 greater than the rate of change of the V-phase winding coil 4 , Therefore, the pair of coil end parts 312 each of the Einpolspulen 31 in the U-phase winding coil 3 stronger and lighter than the pair of coil end parts 412 each of the Einpolspulen 41 in the V-phase winding coil 4 deformed and moved.

The unipolar coils 51 in the W-phase winding coil 5 are just Einpolspulen 51 By winding the electric wire 100 are formed with a substantially same circumferential length. Accordingly, the rate of change of the circumferential length of the electric wire 100 in the U-phase is greater than the rate of change in the V-phase, and the rate of change in the V-phase is greater than the rate of change in the W-phase.

The unipolar coils 52 in the W-phase winding coil 5 may be similar to the single pole coils 31 and 41 the U-phase and V-phase winding coils 3 and 4 to be rejuvenated.

A technique for inserting the winding coils 3 . 4 and 5 the three phases in the stator core 21 and the effects of the three-phase motor 1 with the stator described above 2 are described below.

When inserting the winding coils 3 . 4 and 5 the three phases in the stator core 21 First, the U-phase winding coil 3 in the stator core 21 used as it is in 8th is shown, and then the V-phase winding coil 4 in the stator core 21 used as it is in 9 is shown. Thereafter, the W-phase winding coil 5 in the stator core 21 used as it is in 3 is shown. The pair of insert parts 311 . 411 or 511 in the winding coil 3 . 4 or 5 each phase is offset by a predetermined number of grooves as they enter the grooves 211 be used as it is in 3 is shown. The pair of coil end parts 312 . 412 or 512 in the winding coil 3 . 4 or 5 every phase jumps from the end parts 212 in the axial direction of the stator core 21 before, like it is in 4 is shown.

The technique of inserting the winding coils 3 . 4 and 5 The three phases are described in more detail below.

First, the pair of inserts 311 each unipolar coil 31 in the U-phase winding coil 3 into the grooves 211 of the stator core 21 used as it is in 8th is shown. Thereafter, the pair of coil end parts becomes 312 in the U-phase winding coil 3 deformed and to the outer circumferential side of the stator core 21 moved as it is in 4 is shown, so that the V-phase and W-phase winding coils 4 and 5 in the stator core 21 be used.

In this case, the average perimeter length of the unipolar coils 31 in the U-phase winding coil 3 that is, the average length Cu of the coil end parts 312 in the U-phase winding coil 3 forming electrical wires 100 the longest among the three phases, as described above. Therefore, the pair of coil end parts 312 in the U-phase winding coil 3 easily deformed and strong to the outer circumferential side of the stator core 21 be moved.

In this case, each Einpolspule 31 in the U-phase winding coil 3 wrapped in a tapered shape as described above. Therefore, in the pair of coil end parts 312 in the U-phase winding coil 3 the part where the circumferential length of the electric wire 100 is longer, which is located on the side of the grooves 211 of the stator core 21 facing side, stronger to the outer circumferential side of the stator core 21 deformed and moved.

After that, the pair of insert parts 411 each unipolar coil 41 in the V-phase winding coil 4 into the grooves 211 of the stator core 21 used as it is in 9 is shown. In this case, the pair of coil end parts becomes 412 in the V-phase winding coil 4 partly on the inner circumferential side of the pair of coil end parts 312 in the U-phase winding coil 3 superimposed.

After the V-phase winding coil 4 in the stator core 21 is inserted, the pair of coil end parts 412 in the V-phase winding coil 4 deformed and to the outer circumferential side of the stator core 21 moved as it is in 4 is shown, so that the W-phase winding coil 5 in the stator core 21 is used. In this case, the average perimeter length of the unipolar coils 41 in the V-phase winding coil 4 longer than the average perimeter of the unipolar coils 51 in the W-phase winding coil 5 as described above. That is, the average length Cv of the coil end parts 412 in the V-phase winding coil 4 forming electrical wires 100 longer than the average length Cw of the coil end parts 512 in the W-phase winding coil 5 forming electrical wires 100 is. Therefore, the pair of coil end parts 412 in the V-phase winding coil 4 slightly deformed and to the outer circumferential side of the stator core 21 be moved.

In addition, in this case, each Einpolspule 41 in the V-phase winding coil 4 wrapped in a tapered shape as described above. Therefore, also in the pair of coil end parts 412 in the V-phase winding coil 4 the part where the circumferential length of the electric wire 100 is longer, which is arranged on the side of the grooves 211 of the stator core 21 facing side, stronger to the outer circumferential side of the stator core 21 deform and be moved.

After that, the pair of insert parts 511 each unipolar coil 51 in the W-phase winding coil 5 into the grooves 211 of the stator core 21 used as it is in 3 is shown. In this case, the pair of coil end parts becomes 512 in the W-phase winding coil 5 partly on the inner circumferential side of the pair of coil end parts 412 in the V-phase winding coil 4 superimposed as it is in 4 is shown. The coil end parts 512 in the W-phase winding coil 5 is hardly deformed or moved when placed in the stator core 21 to be ordered.

Thereafter, the neutral point piping parts become 32 . 42 and 52 at the end portion in the second direction C2 in the winding coils 3 . 4 and 5 are arranged to form the neutral point 6 bundled as it is in 5 is shown. In this case, the neutral point piping parts become 32 . 42 and 52 of the three phases in the second direction C2 of the stator core 21 led out, and the neutral point 6 is formed at a position where an offset from the U-phase winding coil 3 is executed at a predetermined angle in the second direction C2.

When the neutral point 6 is formed, the neutral point line part 42 in the V-phase winding coil 4 longer than the neutral point line part 32 in the U-phase winding coil 3 as it is in 1 and 5 is shown. The neutral point line part 52 in the W-phase winding coil 5 is longer than the neutral point line part 42 in the V-phase winding coil 4 ,

In this way, the winding coils 3 . 4 and 5 the three phases in the stator core 21 can be used and can be the neutral point 6 be formed.

With respect to the average circumferential lengths of the single-pole coils 31 . 41 and 51 in the winding coils 3 . 4 and 5 Of the three phases, the average circumferential length in the V phase is shorter than the average circumferential length in the U phase, and the average circumferential length in the W phase is shorter than the average circumferential length in the V phase, as described above. With respect to the pair of coil end parts 312 . 412 or 512 each unipolar coil 31 . 41 or 51 in the winding coil 3 . 4 or 5 each phase becomes the coil end parts 312 in the U-phase hardest to the outer circumferential side of the stator core 21 deformed and shifted, and become the coil end parts 412 less deformed and shifted in the V phase, while the coil end parts 512 are hardly deformed or displaced in the W phase as described above.

Therefore, the protrusion dimensions L1, that is, the protrusion lengths of the coil end parts 312 . 412 and 512 in the three phases of the end parts 212 in the axial direction of the stator core 21 be made as short and equal as possible, as it is in 4 is shown. Accordingly, the overall projection dimension of the coil end parts can be 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases are reduced.

Further, in this example, the ratios of the average lengths Cu, Cv and Cw are the coil end portions 312 . 412 and 512 forming electrical wires 100 in the winding coils 3 . 4 and 5 of the three phases are set such that the ratios Cv / Cu = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98 apply. Therefore, the coil end parts can 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases are deformed and displaced to an optimal extent.

Thus, in the three-phase motor 1 with the stator described above 2 the protrusion dimensions L1 of the coil end parts 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases are made equal as much as possible, and can the overall projection dimension L1 of the coil end parts 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases are reduced to an optimal dimension.

The lengths of neutral point line parts 32 . 42 and 52 in the winding coils 3 . 4 and 5 the three phases are inversely opposite the average circumferential lengths of the unipolar coils 31 . 41 and 51 in the winding coils 3 . 4 and 5 of the three phases varies as described above. The length of the neutral point line part 42 in the V phase is longer than the length of the neutral point line part 32 in the U phase, and the length of the neutral point line part 52 in the W phase is longer than the length of the neutral point line part 42 in the V phase.

Therefore, the difference in the average circumferential length between the Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 of the three phases by the difference in length between the neutral point line parts 32 . 42 and 52 in the winding coils 3 . 4 and 5 the three phases are compensated. This may be the difference in the total length of the winding coils 3 . 4 and 5 of the three phases forming electrical wires 100 minimize.

Thus, in the three-phase motor 1 with the stator described above 2 the line resistance difference between the winding coils 3 . 4 and 5 minimizes the three phases, and can the overall projection dimension L1 of the coil end parts 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases are reduced to an optimal dimension.

Example 2

According to this example, an example of the three-phase motor 1 described in which the ratios of the average lengths Cu, Cv and Cw of the coil end parts 312 . 412 and 512 in the winding coils 3 . 4 and 5 of the three phases forming electrical wires 100 are set to have the ratios Cv / Cu = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98. Table 1 shows the dimensional ratios of the Einpolspulen 31 . 41 and 51 the winding coils 3 . 4 and 5 the three phases in a three-phase motor 1 (Inventive product) according to this example.

Table 1

Each of the unipolar coils 31 . 41 and 51 the winding coils 3 . 4 and 5 the three phases in the three-phase motor 1 according to this example is by six times winding the electric wires 100 shaped (six turns). The first turn of each Einpolspulen 31 . 41 and 51 is at the deepest side in the groove 211 of the stator core 21 when arranging each of the winding coils 3 . 4 and 5 arranged. The sixth turn of each Einpolspulen 31 . 41 and 51 is on the far side of the groove 211 of the stator core 21 arranged.

Each of the unipolar coils 31 and 41 in the U-phase and V-phase winding coils 3 and 4 is a tapered Einpolspule 31 or 41 in the orbital length of the electrical wire forming the coil 100 to the outer circumferential side of the stator core 21 gets shorter. Each of the unipolar coils 51 in the W-phase winding coil 5 is a substantially straight unipolar coil 51 in which the orbital length of the electrical wire forming the coil 100 to the outer circumferential side of the stator core 21 gets a little longer.

Table 2 shows the dimensional ratios of the Einpolspulen 931 . 941 and 951 the winding coils 93 . 94 and 95 the three phases in the conventional three-phase motor 1 (Comparative product, compare 12 ), in which the average lengths Cu, Cv and Cw of the coil end parts 932 . 942 and 952 in the winding coils 93 . 94 and 95 the three-phase electrical wires are substantially the same.

Table 2

In the product according to the invention, the ratios of the average lengths Cu, Cv and Cw are the coil end parts 312 . 412 and 512 the Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 of the three phases forming electrical wires 100 to Cv / Cu = 106/112 = about 0.95 and Cw / Cv = 100.5 / 106 = approximately 0.95. Thus, Cv / Cu and Cw / Cv are made substantially equal.

Both in the product according to the invention and in the comparative product, the lengths of the stator cores were 21 . 921 in the axial direction 100 mm and amounted to the minimum inner diameter of the stator cores 21 and 921 100 mm.

When arranging the winding coils 3 . 4 and 5 the three phases of the product according to the invention in the stator core 21 could the projection dimensions L1 of the coil end parts 312 . 412 and 512 in the winding coils 3 . 4 and 5 of the three phases are made substantially equal, and was the overall projection dimension L1 of the coil end portions 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases approximately 33 mm. In contrast, the winding coils 93 . 94 and 95 of the three phases of the comparison product in the stator core 921 were arranged, the projection dimensions L1 of the coil end parts became 932 . 942 and 952 in the winding coils 93 . 94 and 95 of the three phases consecutively increased from the W phase (cf. 13 ), and the overall protrusion dimension L1 of the coil end parts 932 . 942 and 952 in the winding coils 93 . 94 and 95 the three phases were approximately 37.5 mm.

These results show that in the three-phase motor 1 of the product according to the invention, the overall projection dimension L1 of the coil end parts 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases to an optimal dimension ver can be reduced.

Example 3

According to this example, the average circumferential lengths of the Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 the three phases in the reverse manner by the magnitude of the difference in length between the neutral point line parts 32 . 42 and 52 in the winding coils 3 . 4 and 5 the three phases varies. In order to realize this, according to this example, the average circumferential length of the single-pole coils became 41 in the V-phase winding coil 4 and the average circumferential length of the unipolar coils 51 in the W-phase winding coil 5 determined on the basis of the following equation equations Lv and Lw.

The is called, the relationship equation Lv is expressed as Lv = (S × Lu × n × m-2 × π × R × Sv) / (S × n × m). The Relationship equation Lw is expressed as Lw = (S × Lu × n × m -2 × π × R × Sw) / (S × n × m).

In this example, Lu represents the average circumferential length of the single pole coil 31 in the U-phase winding coil 3 Lv represents the average circumferential length of the unipolar coil 41 in the V-phase winding coil 4 and Lw represents the average circumferential length of the single pole coils 51 in the W-phase winding coil 5 Lv and Lw are determined on the basis of Lu.

In the equations described above, m represents the number of turns of each of the single-pole coils 31 . 41 and 51 in the winding coils 3 . 4 or 5 each phase, and m represents the number of poles of Einpolspulen 31 . 41 or 51 in the winding coil 3 . 4 or 5 each phase. The number of turns of Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 the three phases are the same, and the poles of the unipolar coils 31 . 41 and 51 in the winding coils 3 . 4 and 5 the three phases are also the same.

In the equations described above, n (pi) represents the ratio of the circumference of a circle to its diameter, and R represents the radius from the center O of the stator core 21 to the middle in the radial direction of the groove 211 (Average radius of the stator core 21 , compare 8th ).

In the equations described above, S represents the total number of grooves in the stator core 21 and Sv represents the number of grooves 211 to the the V-phase winding coil 4 from the U-phase winding coil 3 in the first direction C1 of the stator core 21 is offset. In this example, the V-phase winding coil 4 from the U-phase winding coil 3 offset by four grooves in the first direction C1, when this in the stator core 21 is set, and Sv is set to Sv = 4 ( 3 ).

In the equations described above, Sw represents the number of grooves 211 to the the W-phase winding coil 5 from the U-phase winding coil 3 in the first direction C1 of the stator core 21 is offset. In this example, the W-phase winding coil 5 from the U-phase winding coil 3 8 grooves in the first direction C1 when inserting into the stator core 21 and Sw is set to Sw = 8 (compare 3 ).

As it is in 11 are shown, are the Einpolspulen according to this example 31 . 41 and 51 in the winding coils 3 . 4 and 5 the three phases just single pole coils 31 . 41 and 51 By winding the electrical wires 100 be formed with substantially the same circumferential length.

If the circumferential lengths of Einpolspulen 31 . 41 and 51 in the winding coils 3 . 4 and 5 of the three phases in a reverse manner to the neutral point line parts 32 . 42 and 52 in the winding coils 3 . 4 and 5 the three phases around the difference in length in the length between the neutral point line parts 32 . 42 and 52 As varied in this example, the overall lengths of the winding coils 3 . 4 and 5 of the three-phase forming electric wires are made substantially equal, and can the conductor resistance value in the winding coils 3 . 4 and 5 the three phases are made substantially the same.

Therefore, according to this example, the conductor resistance values are in the winding coils 3 . 4 and 5 of the three phases is made substantially equal, and can the overall projection dimension L1 of the coil end parts 312 . 412 and 512 in the winding coils 3 . 4 and 5 the three phases are reduced to an optimal dimension.

The other parts of this example are similar to those of the above Example 1 described, and the like Effects as in Example 1 can be achieved.

The above was a three-phase motor with a stator 2 in which the protrusion dimensions of coil end parts 312 . 412 . 512 in winding coils 3 . 4 . 5 the individual phases can be made as equal as possible and in which the overall projection dimension of the coil end portions in the winding coils of the three phases can be reduced to an optimum dimension. Einpolspulen forming the winding coils of the three phases, each having a pair of coil end parts 312 . 412 . 512 on, from the end parts in the axial Direction of a stator core ( 21 ) project. The winding coils of the three phases have ratios Cv / Cu = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98, where Cu, Cv and Cw average lengths of the coil end portions in the three phases U-phases, Represent V phase and W phase forming electrical wires.

2

2

stator

3

U-phase winding coil

4

V-phase winding coil

5

W-phase winding coil

21

stator core

31

Einpolspule

32

Neutral side lead part

100

electrical Draft

212

end in the axial direction

311

insert

312

Spulenendteil

Claims (17)

Three-phase motor with a stator ( 2 ) by successive insertion of winding coils ( 3 . 4 . 5 ) of the three phases U-phase, V-phase and W-phase in on an inner circumferential surface of a stator core ( 21 ) is formed, wherein the winding coil of each phase by connecting a plurality of Einpolspulen ( 31 . 41 . 51 ) formed by winding electrical wires ( 100 ) and a plurality of turns, and each of the Einpolspulen a pair of insert parts ( 311 . 411 . 511 ) to be inserted in the grooves and a pair of coil end parts ( 312 . 412 . 512 ), which connects the pair of insertion parts, and the winding coils of the three phases have the ratios Cv / Cv = 0.88 to 0.98 and Cw / Cv = 0.88 to 0.98, where Cu is an average length of the electric wires representing the coil end portions of each of the unipolar coils in the U-phase winding coil, Cv represents an average length of the electric wires forming the coil end portions of each of the unipolar coils in the V-phase winding coil, and Cw is an average length of the coil end portions of each of the electric Represents wires that form Einpolspulen in the W-phase winding coil. A three-phase motor according to claim 1, wherein said pair of said Inserted parts of the U-phase winding coil inserted into the grooves is, and that the pair of coil end portions of the U-phase winding coil projects from the end portions in the axial direction of the stator core, and the pair of insertion parts of the V-phase winding coil when inserted into the Grooves from the U-phase winding coil by a predetermined number of grooves in a circumferential direction of the Stator core, and the pair of coil end portions of the V-phase winding coil partially offset superposed on the inner circumferential side of the pair of coil end parts of the U-phase winding coil will, and the pair of insert parts of the W-phase winding coil of the V-phase winding coil by a predetermined number of grooves in a circumferential direction of the stator core when inserted into the grooves are displaced, and the pair of coil end parts of the W-phase winding coil partly on the inner circumferential side of the pair of coil end parts of the V-phase winding coil superimposed becomes. Three-phase motor according to claim 2, wherein the ratio Cv / Cu and the relationship Cw / Cv are substantially the same. A three-phase motor according to claim 3, wherein the circumferential length of electrical wires, the Einpolspulen of at least one of the winding coils of forming three phases, to the outer circumferential side shorter than the stator core becomes. A three-phase motor according to claim 4, wherein in relation to the rate of change of the circumferential length of electric wires, the rate of change in the U-phase winding coil is greater than the rate of change in the V-phase winding coil, and that the rate of change in the V-phase winding coil is greater than the rate of change in the W-phase winding coil. A three-phase motor according to claim 2, wherein the circumferential length of the electrical wires, the Einpolspulen at least one of the winding coils of the three Form phases, to the outer circumferential Side of the stator core shorter becomes. Three-phase motor according to claim 6, wherein with respect to the rate of change the circumferential length the electric wires the rate of change in the U-phase winding coil is greater than the rate of change in the V-phase winding coil is, and that the rate of change in the V-phase winding coil greater than the rate of change in the W-phase winding coil. Three-phase motor according to claim 1, wherein the ratio Cv / Cu and the relationship Cw / Cv are substantially the same. Three-phase motor according to claim 8, wherein the circumferential length of the electrical wires, the Einpolspulen of at least one of the winding coils of forming three phases, to the outer circumferential side shorter than the stator core becomes. Three-phase motor according to claim 9, wherein in relation on the rate of change the circumferential length the electric wires the rate of change in the U-phase winding coil is greater than the rate of change in the V-phase winding coil is, and that the rate of change in the V-phase winding coil greater than the rate of change in the W-phase winding coil. Three-phase motor according to claim 1, wherein the circumferential length of the electrical wires, the Einpolspulen at least one of the winding coils of the three Form phases, to the outer circumferential Side of the stator core shorter becomes. Three-phase motor with a stator that can be replaced by inserting winding coils ( 3 . 4 . 5 ) of the three phases U-phase, V-phase and W-phase in on an inner circumferential surface of a stator core ( 21 ) provided grooves ( 211 ) is formed, wherein the winding coil of each phase a plurality of Einpolspulen ( 31 . 41 . 51 ), which are formed by winding electrical wires in a plurality of turns, a connecting wire ( 34 . 44 . 54 ) for connecting the Einpolspulen and a pair of pipe parts ( 32 and 33 . 42 and 43 . 52 and 53 ) formed by taking out the electric wires from the unipolar coils arranged at both ends of the plurality of Einpolspulen, and each of the Einpolspulen a pair of insert parts ( 311 . 411 . 511 ) to be inserted in the grooves and a pair of coil end parts ( 312 . 412 . 512 ), which connects the pair of insertion parts, and with respect to average circumferential lengths of the unipolar coils in the winding coils of the three phases, the average circumferential length in the V-phase winding coil is shorter than the average circumferential length in the U-phase winding coil, and the average circumferential length in the W-phase winding coil is shorter than the average circumferential length in the V-phase winding coil, and the pair of insertion parts of the U-phase winding coil is inserted into the grooves and the pair of coil end parts of the U-phase winding coil of the end portions in the axial Projecting direction of the stator core, and the pair of insertion parts of the V-phase winding coil is placed in the grooves of the U-phase winding coil by a predetermined number of grooves in a first direction, which is a circumferential direction of the stator core, and Pair of coil end portions of the V-phase winding coil partially on an inner circumferential side de superimposed on the pair of coil end portions of the U-phase winding coil, and the pair of insertion portions of the W-phase winding coil are set in the first direction of the stator core by a predetermined number of slots upon insertion into the slots, and the pair of coil end portions of the stator core W-phase winding coil is partially superimposed on an inner circumferential side of the pair of coil end portions of the V-phase winding coil, and of the pair of line portions of the winding coil of each phase of the line portion, at an end portion in a second direction opposite to that the first direction of the stator core is arranged, is used as neutral point line part, and the neutral point line parts of the winding coils of the three phases are focused to form a neutral point at a position at which an offset from the U-phase winding coil by a predetermined angle in the second Direction is made, so that the neutral point line part of the V-phase winding is longer than the neutral point line portion of the U-phase winding coil, and the neutral point line portion of the W-phase winding coil is longer than the neutral point line portion of the V-phase winding coil. The three-phase motor according to claim 12, wherein an average circumferential length Lv of the single-pole coils in the V-phase winding coil and an average circumferential length Lw of the single-pole coils in the W-phase winding coil satisfy the following relationship equations: Lv = (S · Lu · n · m - 2 · π · R · Sv) / (S · n · m) and Lw = (S · Lu · n · m - 2 · π · R · Sw) / (S · n · m) where Lu represents the average circumferential length of the unipolar coils in the U-phase winding coil, n represents the number of turns of each unipolar coil in the winding coil of each phase, m represents the number of poles of the unipolar coils in the winding coil of each phase, π (pi) is the ratio of the circumference of one phase Represents circle to its diameter, R represents the radius from the center of the stator core to the center in the radial direction of the groove, S represents the total number of slots in the stator core, Sv represents the number of slots facing the V-phase winding coil the U-phase winding coil is offset in the first direction of the stator core, and Sw represents the number of grooves by which the W-phase winding coil is offset from the U-phase winding coil in the first direction of the stator core. Three-phase motor according to claim 13, wherein the circumferential length of the the Einpolspulen the U-phase and V-phase winding coils forming electrical wires to the outer circumferential Shorter side of the stator core become. Three-phase motor according to claim 14, wherein in relation on the rates of change the circumferential length of electrical wires the rate of change in the U-phase winding coil is greater than the rate of change in the V-phase winding coil is. Three-phase motor according to claim 12, wherein the circumferential length of the the Einpolspulen the U-phase and V-phase winding coils forming electrical wires to the outer circumferential Shorter side of the stator core become. Three-phase motor according to claim 16, wherein in relation on the rates of change the circumferential length of electrical wires the rate of change in the U-phase winding coil is greater than the rate of change in the V-phase winding coil is.